The half-life of iodine-131 is 8 days.Approximately how long would it take for 1 milligram of 1-131 to decay to 1/2 milligram of 1-131?
Answer(s): D
If the amount of 1-131 is reduced by one-half every 8 days: 8 mg (8 days), 4 mg (8 days), 2 mg (8 days), 1/2 mg. It would take 32 days (approximately 1 month).
A magnetic compass points in the direction of the __________.
A magnetic compass is influenced by all magnetic sources in its vicinity and aligns itself according to the net magnetic field at that location.
The mass of 1 cubic meter of water is approximately __________.
One meter equals 100 centimeters. Therefore, 1 cubic meter equals 1,000,000 cubic centimeters. Since each cubic centimeter has amass of 1 gram, the approximate total mass is 1,000 kilograms.
A 1-kilogram mass is dropped from a height of 1 meter.Its kinetic energy just before it hits the ground is __________.
Answer(s): B
Gravitational potential energy is converted to kinetic energy. The kinetic energy is equal to the mass of the object times the force of gravity times the height. Thus, mgh = 1 kilogram × 9.8 meters/second × 1 meter = (approximately) 10 joules.
A magnifying glass is what kind of lens used on objects how far away?
Answer(s): A
An object held closer than one focal length from a convex lens will produce a virtual magnified image.
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